| PC/MS-Windows pack. |  Alicia Quatermain 2 - The Stone of Fate Model 667040 | 20?? | Steam Valve Corp. |
| PC/MS-Windows pack. | Alicia Quatermain 3 - The Mystery of the Flaming Gold Model 818030 | 20?? | Steam Valve Corp. |
| PC/MS-Windows pack. | Alicia Quatermain 4 - Da Vinci and The Time Machine Model 1020080 | 20?? | Steam Valve Corp. |
| PC/MS-Windows pack. |  Alien - Chip Demo Model 1985990 | 20?? | Steam Valve Corp. |
| PC/MS-Windows pack. | Alien - Chip Model 1272470 | 20?? | Steam Valve Corp. |
| PC/MS-Windows pack. | Alien Accident Model 1758100 | 20?? | Steam Valve Corp. |
| PC/MS-Windows pack. | Alien Age Model 1774390 | 20?? | Steam Valve Corp. |
| PC/MS-Windows pack. | Alien Agent X Model 2257590 | 20?? | Steam Valve Corp. |
| PC/MS-Windows pack. | Alien AI Demo Model 1523770 | 20?? | Steam Valve Corp. |
| PC/MS-Windows pack. | Alien Ai Model 1483110 | 20?? | Steam Valve Corp. |
| PC/MS-Windows pack. | ALIEN ANIMALS - SANDBOX Demo Model 1468980 | 20?? | Steam Valve Corp. |
| PC/MS-Windows pack. | Alien Arena - Warriors of Mars Model 629540 | 20?? | Steam Valve Corp. |
| PC/MS-Windows pack. | Alien Attack - Pocket Edition Demo Model 907800 | 20?? | Steam Valve Corp. |
| PC/MS-Windows pack. | Alien Attack in Space Demo Model 582140 | 20?? | Steam Valve Corp. |
| PC/MS-Windows pack. | Alien Attack Model 391310 | 20?? | Steam Valve Corp. |
| PC/MS-Windows pack. | Alien Battlefield Model 2282700 | 20?? | Steam Valve Corp. |
| PC/MS-Windows pack. | Alien Blitz Model 434240 | 20?? | Steam Valve Corp. |
| PC/MS-Windows pack. | Alien Boom Boom Model 2307020 | 20?? | Steam Valve Corp. |
| PC/MS-Windows pack. | Alien Breed - Impact Demo Model 22620 | 20?? | Steam Valve Corp. |
| PC/MS-Windows pack. | Alien Breed - Impact Model 22610 | 20?? | Steam Valve Corp. |
| PC/MS-Windows pack. | Alien Breed 2 - Assault Demo Model 22660 | 20?? | Steam Valve Corp. |
| PC/MS-Windows pack. | Alien Breed 2 - Assault Model 22650 | 20?? | Steam Valve Corp. |
| PC/MS-Windows pack. | Alien Breed 3 - Descent Demo Model 22680 | 20?? | Steam Valve Corp. |
| PC/MS-Windows pack. | Alien Breed 3 - Descent Model 22670 | 20?? | Steam Valve Corp. |
| PC/MS-Windows pack. | Alien Cat 2 Model 1324030 | 20?? | Steam Valve Corp. |
| PC/MS-Windows pack. | Alien Cat 3 Model 1339550 | 20?? | Steam Valve Corp. |
| PC/MS-Windows pack. | Alien Cat 5 Model 1366750 | 20?? | Steam Valve Corp. |
| PC/MS-Windows pack. | Alien Cat 6 Model 1370180 | 20?? | Steam Valve Corp. |
| PC/MS-Windows pack. | Alien Cat 7 Model 1371460 | 20?? | Steam Valve Corp. |
| PC/MS-Windows pack. | Alien Cat 8 Model 1387870 | 20?? | Steam Valve Corp. |
| PC/MS-Windows pack. | Alien Cat Model 1247170 | 20?? | Steam Valve Corp. |
| PC/MS-Windows pack. | Alien Colosseum Demo Model 2139980 | 20?? | Steam Valve Corp. |
| PC/MS-Windows pack. | Alien Colosseum Model 1722580 | 20?? | Steam Valve Corp. |
| PC/MS-Windows pack. | Alien Cow Farm Model 1036620 | 20?? | Steam Valve Corp. |
| PC/MS-Windows pack. | Alien Creatures Model 1123060 | 20?? | Steam Valve Corp. |
| PC/MS-Windows pack. | Alien Crusader Model 786370 | 20?? | Steam Valve Corp. |
| PC/MS-Windows pack. | Alien Dawn Demo Model 1761170 | 20?? | Steam Valve Corp. |
| PC/MS-Windows pack. | Alien Dawn Model 1376580 | 20?? | Steam Valve Corp. |
| PC/MS-Windows pack. | Alien Death Mob Model 1567490 | 20?? | Steam Valve Corp. |
| PC/MS-Windows pack. | Alien Decimation Model 1909170 | 20?? | Steam Valve Corp. |
